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디젤 SCR 후처리장치 내 공간속도가 NOx 저감에 미치는 영향
왕태중(Tae Joong Wang),백승욱(Seung Wook Baek),강대환(Dae Hwan Kang),길정기(Jung Ki Kil),여권구(Gwon Koo Yeo) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The present study conducted a numerical modeling on the diesel SCR (selective catalytic reduction) system using ammonia as a reductant over vanadium-based catalysts (V₂O?-WO₃/TiO₂). Transient modeling for ammonia adsorption/desorption on the catalyst surface was firstly carried out, and then the SCR reaction was modeled considering for it. In the current catalytic reaction model, we extended the pure chemical kinetic model based on laboratory-scale powdered-phase catalyst experiments to the chemico-physical one applicable to realistic commercial SCR reactors. To simulate multi-dimensional heat and mass transfer phenomena, the SCR reactor was modeled in two dimensional, axisymmetric domain using porous medium approach. Also, since diesel engines operate in transient mode, the present study employed an unsteady model. In addition, throughout simulations using the developed code, effects of space velocity on the DeNOx performance were investigated.